--- sys/cddl/compat/opensolaris/kern/opensolaris_vfs.c.orig
+++ sys/cddl/compat/opensolaris/kern/opensolaris_vfs.c
@@ -196,6 +196,7 @@
 		VI_UNLOCK(vp);
 		vrele(vp);
 		vfs_unbusy(mp);
+		vfs_freeopts(mp->mnt_optnew);
 		vfs_mount_destroy(mp);
 		*vpp = NULL;
 		return (error);
